A composite wiring includes a plurality of pieces of wiring accommodated and gathered together within an elastic sheath, wherein at least one of the pieces of wiring is elastic wiring including an elastic tube, a conductor wire arranged within the tube, and fixing portions for fixing the conductor wire and the tube at both ends of the tube in the lengthwise direction thereof, the length of the conductor wire between the fixing portions when the tube is in an unextended state being longer than the length of the tube between the fixing portions.